Balanced slide-valve.



No. 747,023. PATENTED DEC. 15, 1903. G. L. WAGKBROW.

BALANCED SLIDE VALVE.

APPLICATION FILED MAY 27, .1903.

N0 MODEL.

A TTORNE Y8.

"m: Noanvs PETERS co PKOYO-LIYNO, NASHKNC-TONID cv lltvrran dramasPatented December 15, 1903.

arnwr rrrcn.

GEORGE LESLIE WAOKEROW, OF MELL ETTE, SOUTH DAKOTA, ASSIGNOR OF ONE-HALFTO FRED G. STIOKLES, VALENTINE M. MILLER, OHARLES H. BRUNN, AND GEORGEM. RANDALL, OF MELLETTE, SOUTH DAKOTA.

BALANCED SLIDE-VALVE.

SEEGIFICAELTION forming part of Letters Patent No. 747,023, datedDecember 15, 1903.

Application filed May 27, 1903. Serial Ila-158,943. (N model.)

T0 at whom, it may concern:

Be it known that I, GEORGE LEsLIE WAoK- EROW, a resident of Mellette, inthe county of Spink and State of South Dakota, have invented certain newand useful Improvements in Balanced Slide-Valves, of which the followingis a specification.

The invention relates to slide valves in general, and has for its chiefobject novel and improved exhausting means specially intended forbalanced slide-valves, but-adapted to any similar type of valve.

The invention consists of novel constructions and arrangement of parts,which I will now proceed to describe in detail with reference to theaccompanying drawings, forming a part of this specification.

In the drawings, Figure 1 is a central vertical longitudinal sectionalview showing my invention. Fig. 2 is a transverse sectional View on line(B a: of Fig. 1; and Fig. 3 is a top plan view with the steam-chestremoved,

showing my peculiar feed and exhaust ports.

In carrying out my invention I employ acylinderAofanyapprovedconformation,having a substantially flat top orupper side '13, provided with a guideway O, which forms the seat for myimproved valve D. Near each end of the cylinder A and in the-guideway O,

I form two ports E E, of which E is a feedport' leading direct into thecylinder and E an exhaust-port with an outlet F, as shown. Over thevalve D, I arrange a suitable casing or chest G, having open endsadapted to be closed by plates H, which may or may not be in one piecewith the end plates I of the cylinder A. The casing G and the end platesH I may be secured by tap-bolts J, as shown in Figs. 1 and 2, or byother suitable and ap- 40 proved means. It will be noticed that my valveD is substantially U shape and that it is hollow from end to end. Thehollow passage through the valve ends with enlargving openings K,adapted at all time to cover both exhaust-posts E and one feed-port E.In other words, the valve is intended to be long enough adapted ateither adjustment to have its enlarged end openings cover an eX- haustand feed port at one end of thecylinder and the exhaust-port at theother end of the cylinder. Itis understood that the valve must have somemeans, substantially as the rod L, connecting it with shifting mechanismand also that a piston M and piston-rod N are employed. By reference toFig. 2 of my drawings it will be noticed that steam in the chest G hasfree circulation around the body portion of the valve, and therebyeffecting perfect balance. The guideway O prevents lateral movement ofthe valve and insures proper covering of the ports.

While more or less novelty resides in minor details of myinvention, itschief feature, and to which I call special attention, is the peculiarexhausting means afforded, which is substantially continuous throughboth outlets F. I have hereinbefore referred to the enlarged open endsto the passage-way through my valve. The object of making the endopenings enlarged is to provide free and unobstructed exit from the portE into and through the port E. The exhaust is further improved andincreased by providing conjoint passage thereof through the hollow valveand the exhaust-port E at the other end of the cylinder. In brief, whenthe piston is moving forward the engine will be exhausting through theport E, enlarged open end of the hollow valve, port E, and the outlet Fof the latter port at this end of the cylinder A. During the same timepart of the exhaust-steam will pass through the hollow valve to the portE at the rearend of the cylinder and exit through its outlet F.Obviously at this time the valve is at its forward position, leaving theport E at the rear of the cylinder uncovered and adapted to feed livesteam from the chest G direct into the cylinder with force, in rear ofthe piston. Backward movement of the valve leaves the port E at theforward end of the cylinder uncovered, providing open communicationbetween the steam-chest and the cylinder at the forward end of thelatter. In this position of the valve the forward port E 5 will feedsteam while all the other ports are exhausting, as herein before fullydescribed. Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is

1. In combination with an engine-cylinder, a steam-chest having two setsof ports at opposite ends thereof, one port in each set being adapted tofeed direct into the enginecylinder and with the other port of each setadapted to provide direct exhaust, a U shaped slide-valve in thesteam-chest, with its whole upper side below the inner top side of thesaid chest, and its under side elevated adapted to form a surroundingsteam-space, the said slide-valve having a passage-way therethrough fromend to end terminating with downwardly-enlarging end openings, the saidenlarging openings being adapted, with the valve on its seat, to coverone direct port into the engine-cylinder and both direct exhaustportssubstantially as described.

2. In combination with an engine-cylinder, a steam -chest, a reducedguideway in the steam-chest, extending from end to end thereof, aU-shaped valve seated in the said guide- Way and with its whole upperside below the inner top side of the said chest, and its under sideelevated adapted to form a surrounding steam-space, the U-shaped valvehaving a passage-way from end to end terminating withdownwardly-enlarging end openings, the said steam-chest having two setsof ports with one port in each set adapted to feed direct into theengine-cylinder, and the other port of each set providing directexhaust, the enlarging end openings of the said passageway, through thevalve, being adapted to provide open communication through one directport into the engine-cylinder and both direct exhaust-portssubstantially as described.

GEORGE LESLIE WAGKEROW.

Witnesses:

R. H. MOOAUGHEY, CHAS. W. RICHARDSON.

